Before building a Dockerfile, the system requirements and all packages used in your projects must be defined in the Dockerfile. In this example, I defined a long list of the system requirements because of renv.lock file. Please, check requirements of the R packages you used on Posit Package Manager.

First, build the Dockerfile for R Shiny Environment

docker build -t example/dev_r_shiny_env .

Go to App folder then build the Dockerfile for App

docker build -t example/shiny_app .

If your are working locally, you can use this line to build Dockerfile

DOCKER_BUILDKIT=0  docker build -t example/shiny_app .

Run the app in production

docker run -d -p 3838:3838 example/shiny_app

Launch browser: http://localhost:3838/

In order to create renv.lock file properly,

options(renv.config.auto.snapshot = T)
renv::settings$snapshot.type("all")
renv::snapshot()